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Configuring Spanning Tree STP/RSTP Configurations
User Guide 403
Figure 2-2 Configuring STP/RSTP Globally
Follow these steps to configure STP/RSTP globally:
1) In the Parameters Config section, configure the global parameters of STP/RSTP and
click Apply.
CIST Priority Specify the CIST priority for the switch. CIST priority is a parameter used to
determine the root bridge for spanning tree. The switch with the lower value
has the higher priority.
In STP/RSTP, CIST priority is the priority of the switch in spanning tree. The
switch with the highest priority will be elected as the root bridge.
In MSTP, CISP priority is the priority of the switch in CIST. The switch with the
higher priority will be elected as the root bridge in CIST.
Hello Time Specify the interval between BPDUs’ sending. The default value is 2.The root
bridge sends configuration BPDUs at an interval of Hello Time. It works with
the MAX Age to test the link failures and maintain the spanning tree.
Max Age Specify the maximum time that the switch can wait without receiving a BPDU
before attempting to regenerate a new spanning tree. The default value is 2.
Forward Delay Specify the interval between the port state transition from listening to
learning. The default value is 15. It is used to prevent the network from
causing temporary loops during the regeneration of spanning tree. The
interval between the port state transition from learning to forwarding is also
the Forward Delay.
Tx Hold Count Specify the maximum number of BPDU that can be sent in a second. The
default value is 5.
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